Humidifier



FIG. 1 is a perspective view of a humidifier showing my new design;

FIG. 2 is a right-side view of the humidifier shown in FIG. 1, theleft-side view being a mirror image thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The ornamental design for a humidifier, as shown and described.